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| Polyphase Kaiser Filter for the Correction of I/Q Imbalance of Digital Synthetic Aperture Radar |
| Huang Guang-min①②; Gao Xiang-wu①②; Yang Ru-liang① |
| ①Institute of Electronics Chinese Academy of Sciences Beijing 100080 China;②Graduate School of the Chinese Academy of Sciences Beijing 100039 China |
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Abstract The principle of the quadrature coherent detector of the digital Synthetic Aperture Radar (SAR) is introduced in the paper. The imbalance of its I/Q is analyzed, and the uniform index of its imbalance is presented. For the correction of the digital SAR I/Q imbalance, the paper adopts a new method-interpolation polyphase Kaiser filter. The results show that when the stage of the polyphase Kaiser filter is 16 the ratio of sidelobe suppression is -74dB, and the relative instant frequency error is -1.18%.
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Received: 12 November 2002
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2004, Vol. 26 
